cutting edge 17

lying awake

in the middle of the night

a growing body of evidence

uninterrupted sleep

in the early 〜s

a group of people

keep in darkness

for a month

settled into A

distinct

fall into A

continuos hours

more recently

influential paper

drawn from A

used to do

in two distinct periods

present

reference to A

court

much like

the number of references to this sleeping pattern

significant

countless player manuals

began to disappear

the urban upper class

over the course of A

the idea of A

the reasons for the initial shift

as improvements

production of A

followed by A